Testing for association (L9)

Question 1

What types of correlation do we use in this course

Answer 1

Positive, negative, linear and simple regression

Question 2

What is correlation

Answer 2

it measures the relative strength of the linear relationship between two variables

Question 3

What is the threshold for correlation effect sizes

Answer 3

±.1 = small effect
±.3 = medium effect
±.5 = large effect

Question 4

What is regression analysis

Answer 4

Regression Analysis looks at how one number (like test scores) changes when another number (like study hours) changes.

Question 5

differentiate correlation with regression

Answer 5

Correlation examines the relationship between variables without distinguishing between independent and dependent variables, while regression predicts the dependent variable’s values based on known independent variable values by fitting the best-fitting line to the data.

Question 6

what is multiple linear regression vs simple linear regression

Answer 6

multiple investigates the relationship between two or more metric IVs and corresponding metric DV. while simple investigates just one.

Question 7

what 3 things should be reported for correlation

Answer 7

significant positive or negative relationship - the size of r - S,M or L effect